The bug on the cisco site appears to be:
CSCvb89733
We've implemented :
qos queue-softmax-multiplier 1200
And this has alleviated the drops for the time being, by allocating
more softmax, but hardmax remains at 120...
The bug says this is present in 16.3.3a, so not sure why we're getting
it in 16.3.5b?
On 12/10/2018 12:14, Giles Coochey wrote:
Hi All,
I am managing a number of 3850-24XS Catalysts, running Denali 16.3.5b.
These have 24 10Gig interfaces and they're seeing a large number of
output discards on these.
The output of the following command shows the hardmax/softmax queues
on the interface:
#show platform hardware fed switch active qos queue config interface
te1/0/1
DATA Port:7 GPN:873 AFD:Disabled QoSMap:0 HW Queues: 56 - 63
DrainFast:Disabled PortSoftStart:2 - 1080
----------------------------------------------------------
DTS Hardmax Softmax PortSMin GlblSMin PortStEnd
--- -------- -------- -------- --------- ---------
0 1 5 120 2 480 6 320 0 0 5 1440
1 1 4 0 6 720 3 480 2 180 5 1440
2 1 4 0 5 0 5 0 0 0 5 1440
3 1 4 0 5 0 5 0 0 0 5 1440
4 1 4 0 5 0 5 0 0 0 5 1440
5 1 4 0 5 0 5 0 0 0 5 1440
6 1 4 0 5 0 5 0 0 0 5 1440
7 1 4 0 5 0 5 0 0 0 5 1440
According to the following link about Troubleshooting Output drops on
this platform these are the buffer values for a 1Gig interface?
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/200594-Catalyst-3850-Troubleshooting-Output-dr.html
Does anyone know whether there is a bug-id for this, and whether it is
fixed in any Denali 16.3.x ?
In the document it specifies that:
The show command that can be used to see this allocation is ‘show
platform qos queue config <interface>’.
For a 1Gig interface,
3850#show platform qos queue config gigabitEthernet 1/0/1
DATA Port:20 GPN:66 AFD:Disabled QoSMap:0 HW Queues: 160 - 167
DrainFast:Disabled PortSoftStart:1 - 1080
----------------------------------------------------------
DTS Hardmax Softmax PortSMin GlblSMin PortStEnd
--- -------- -------- -------- --------- ---------
0 1 5 120 6 480 6 320 0 0 3 1440
1 1 4 0 7 720 3 480 2 180 3 1440
2 1 4 0 5 0 5 0 0 0 3 1440
3 1 4 0 5 0 5 0 0 0 3 1440
4 1 4 0 5 0 5 0 0 0 3 1440
5 1 4 0 5 0 5 0 0 0 3 1440
6 1 4 0 5 0 5 0 0 0 3 1440
7 1 4 0 5 0 5 0 0 0 3 1440
<<output omitted>>
For a 10Gig interface,
3850#show platform qos queue config tenGigabitEthernet 1/0/37
DATA Port:1 GPN:37 AFD:Disabled QoSMap:0 HW Queues: 8 - 15
DrainFast:Disabled PortSoftStart:2 - 6480
----------------------------------------------------------
DTS Hardmax Softmax PortSMin GlblSMin PortStEnd
--- -------- -------- -------- --------- ---------
0 1 6 720 8 2880 7 1280 0 0 4 8640
1 1 4 0 9 4320 8 1920 3 1080 4 8640
2 1 4 0 5 0 5 0 0 0 4 8640
3 1 4 0 5 0 5 0 0 0 4 8640
4 1 4 0 5 0 5 0 0 0 4 8640
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